C 23 - Silver Sliver (Monty Chandler)

Celestial hemisphere: Northern · Constellation: Andromeda (And) · Contains: HD14437 · HD14771 · NGC 891 · NGC 898

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C 23 - Silver Sliver

Link: https://montychandler.smugmug.com/Astrophotography/The-Heavans/i-6KDrrjn/A

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C 23 - Silver Sliver

Link: https://montychandler.smugmug.com/Astrophotography/The-Heavans/i-6KDrrjn/A

Caldwell 23

If we could travel across space and time to see our own galaxy from the outside looking in, it would probably look a lot like Caldwell 23. This edge-on unbarred spiral galaxy, also cataloged as NGC 891, is about 35 million light-years away from Earth in the constellation Andromeda. The object is visible in small to moderate size telescopes as a faint elongated smear of light with a dust lane visible in larger apertures. A few foreground stars from the Milky Way shine brightly, while more-distant galaxies can be seen in the lower right corner of the image.

Astronomers used Hubble’s observations of Caldwell 23 to learn more about the structure and evolution of spiral galaxies. One of their findings helped identify the source of Caldwell 23’s galactic halo. The halo surrounds the galaxy and primarily contains old stars, some of which are grouped together in large, sphere-shaped collections called globular clusters. The source of this halo material has been unclear, since theoretically it could either originate in the galaxy or be gravitationally pulled in from the area surrounding the galaxy. Scientists using Hubble found that Caldwell 23’s halo is similar in composition to other material in the galaxy, which suggests that the halo material was expelled from within the galaxy.

Please note: The following tables are updated every 24 hours.

Distribution of astrophotographers

This table shows the number of distinct astrophotographers who have been assigned and IOTD/TP award compared to the total number of images awarded.
	Distinct awarded users	Total awarded images
Image of the day
Top picks
Top pick nominations

Distribution of subject types

This table shows the distribution of awards per subject type, compared to the popularity of images of that subject type.
	Image of the day	Top pick	Top pick nominations	Total submitted
Deep sky
Solar system
Extremely wide field
Star trails
Northern lights
Noctilucent clouds
Landscape

Distribution of data sources

This table shows the distribution of awards per data source, compared to the popularity of images acquired from that data source.
	Image of the day	Top pick	Top pick nominations	Total submitted
Backyard
Traveller
Own remote observatory
Amateur hosting facility
Public amaeteur data
Professional, scientific grade data
Mix of multiple sources
Other
Unknown

The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

Submitted The date and time when you submitted this image for IOTD/TP consideration.	...
Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
Promotions by Submitters When 3 distinct Submitters promote the image, it moves on to the next stage of the process: evaluation for Top Pick status. This requirement, in addition to anonymization of images and distribution to only a subset of them, prevents biases and ensures that the best images are selected.
Promotions by Reviewers When 3 distinct Reviewers promote the image, it moves on to the next stage of the process: evaluation for IOTD status.
Early dismissal Staff members have a lot of images to inspect on a daily basis, and they can dismiss images if they believe they don't meet the requirements for IOTD/TP selection. If an image is dismissed 5 times, it's removed from the process. This streamlines the process and ensures that any bias present in promotions could be overruled by other staff members.

Status	Advanced success
Started	...
Astrometry.net job	6534423
PixInsight job	6N7WZCV7XSVIPR2JT43P6QPG9OMBS8A2
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	02h22m30s.74
RA (top/left)	02h20m34s.64
RA (top/right)	02h19m37s.50
RA (bottom/right)	02h24m24s.65
RA (bottom/left)	02h25m28s.10

Dec (center)	+42°21′00″.1
Dec (top/left)	+43°06′49″.3
Dec (top/right)	+41°41′58″.3
Dec (bottom/right)	+41°34′59″.9
Dec (bottom/left)	+42°59′44″.8

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C 23 - Silver Sliver

C 23 - Silver Sliver

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C 23 - Silver Sliver

C 23 - Silver Sliver

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